Keystone definition

kēstōn
(architecture) The central wedge-shaped stone of an arch that locks its parts together.
noun
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The central, topmost voussoir of an arch, popularly thought of as especially holding the others in place.
noun
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That one of a number of associated parts or things that supports or holds together the others; main part or principle.
noun
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Designating, of, or like the slapstick comedy of a series of silent films featuring a bungling, inept squad of policemen (Keystone Kops or Keystone Cops) in wild chases, etc.
adjective
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(architecture) The top stone of an arch.
noun
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A native or resident of the American state of Pennsylvania.
noun
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The central supporting element of a whole.
noun
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Other Word Forms

Noun

Singular:
keystone
Plural:
keystones